debugfs/xattrs.c

   1 /*
   2  * xattrs.c --- Modify extended attributes via debugfs.
   3  *
   4  * Copyright (C) 2014 Oracle.  This file may be redistributed
   5  * under the terms of the GNU Public License.
   6  */
   7
   8 #include "config.h"
   9 #include <stdio.h>
  10 #ifdef HAVE_GETOPT_H
  11 #include <getopt.h>
  12 #else
  13 extern int optind;
  14 extern char *optarg;
  15 #endif
  16 #include <ctype.h>
  17 #include "support/cstring.h"
  18
  19 #include "debugfs.h"
  20 #include "ext2fs/ext4_acl.h"
  21 #include "ext2fs/lfsck.h"
  22
  23 #define PRINT_XATTR_HEX         0x01
  24 #define PRINT_XATTR_RAW         0x02
  25 #define PRINT_XATTR_C           0x04
  26 #define PRINT_XATTR_STATFMT     0x08
  27 #define PRINT_XATTR_NOQUOTES    0x10
  28
  29 extern const char *debug_prog_name;
  30
  31 /* Dump extended attributes */
  32 static void print_xattr_hex(FILE *f, const char *str, int len)
  33 {
  34         int i;
  35
  36         for (i = 0; i < len; i++)
  37                 fprintf(f, "%02x ", (unsigned char)str[i]);
  38 }
  39
  40 /* Dump extended attributes */
  41 static void print_xattr_string(FILE *f, const char *str, int len, int flags)
  42 {
  43         int printable = 0;
  44         int i;
  45
  46         if (flags & PRINT_XATTR_RAW) {
  47                 fwrite(str, len, 1, f);
  48                 return;
  49         }
  50
  51         if ((flags & PRINT_XATTR_C) == 0) {
  52                 /* check: is string "printable enough?" */
  53                 for (i = 0; i < len; i++)
  54                         if (isprint(str[i]))
  55                                 printable++;
  56
  57                 if (printable <= len*7/8)
  58                         flags |= PRINT_XATTR_HEX;
  59         }
  60
  61         if (flags & PRINT_XATTR_HEX) {
  62                 print_xattr_hex(f, str, len);
  63         } else {
  64                 if ((flags & PRINT_XATTR_NOQUOTES) == 0)
  65                         fputc('\"', f);
  66                 print_c_string(f, str, len);
  67                 if ((flags & PRINT_XATTR_NOQUOTES) == 0)
  68                         fputc('\"', f);
  69         }
  70 }
  71
  72 static void print_xattr(FILE *f, char *name, char *value, size_t value_len,
  73                         int print_flags)
  74 {
  75         print_xattr_string(f, name, strlen(name), PRINT_XATTR_NOQUOTES);
  76         fprintf(f, " (%zu)", value_len);
  77         if ((print_flags & PRINT_XATTR_STATFMT) &&
  78             (strcmp(name, "system.data") == 0))
  79                 value_len = 0;
  80         if (value_len != 0 &&
  81             (!(print_flags & PRINT_XATTR_STATFMT) || (value_len < 120))) {
  82                 fprintf(f, " = ");
  83                 print_xattr_string(f, value, value_len, print_flags);
  84         }
  85         fputc('\n', f);
  86 }
  87
  88 static int print_acl(FILE *f, void *name, void *value, size_t value_len)
  89 {
  90         const ext4_acl_header *ext_acl = (const ext4_acl_header *)value;
  91         const char *cp;
  92
  93         if (!value ||
  94             (value_len < sizeof(ext4_acl_header)) ||
  95             (ext_acl->a_version != ext2fs_cpu_to_le32(EXT4_ACL_VERSION)))
  96                 return -EINVAL;
  97
  98         cp = (const char *)value + sizeof(ext4_acl_header);
  99         value_len -= sizeof(ext4_acl_header);
 100
 101         fprintf(f, "%s:\n", name);
 102
 103         while (value_len > 0) {
 104                 const ext4_acl_entry *disk_entry = (const ext4_acl_entry *)cp;
 105                 posix_acl_xattr_entry entry;
 106                 entry.e_tag = ext2fs_le16_to_cpu(disk_entry->e_tag);
 107                 entry.e_perm = ext2fs_le16_to_cpu(disk_entry->e_perm);
 108
 109                 switch(entry.e_tag) {
 110                         case ACL_USER_OBJ:
 111                         case ACL_USER:
 112                                 fprintf(f, "    user:");
 113                                 if (entry.e_tag == ACL_USER)
 114                                         fprintf(f, "%u",
 115                                         ext2fs_le32_to_cpu(disk_entry->e_id));
 116                                 break;
 117
 118                         case ACL_GROUP_OBJ:
 119                         case ACL_GROUP:
 120                                 fprintf(f, "    group:");
 121                                 if (entry.e_tag == ACL_GROUP)
 122                                         fprintf(f, "%u",
 123                                         ext2fs_le32_to_cpu(disk_entry->e_id));
 124                                 break;
 125
 126                         case ACL_MASK:
 127                                 fprintf(f, "    mask:");
 128                                 break;
 129
 130                         case ACL_OTHER:
 131                                 fprintf(f, "    other:");
 132                                 break;
 133
 134                         default:
 135                                 fprintf(stderr,
 136                                         "%s: error: invalid tag %x in ACL\n",
 137                                         debug_prog_name, entry.e_tag);
 138                                 return -EINVAL;
 139                 }
 140                 fprintf(f, ":");
 141                 fprintf(f, (entry.e_perm & ACL_READ) ? "r" : "-");
 142                 fprintf(f, (entry.e_perm & ACL_WRITE) ? "w" : "-");
 143                 fprintf(f, (entry.e_perm & ACL_EXECUTE) ? "x" : "-");
 144                 fprintf(f, "\n");
 145
 146                 if (entry.e_tag == ACL_USER || entry.e_tag == ACL_GROUP) {
 147                         cp += sizeof(ext4_acl_entry);
 148                         value_len -= sizeof(ext4_acl_entry);
 149                 } else {
 150                         cp += sizeof(ext4_acl_entry_short);
 151                         value_len -= sizeof(ext4_acl_entry_short);
 152                 }
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int print_fidstr(FILE *f, void *name, void *value, size_t value_len)
 159 {
 160         struct filter_fid_old *ff = value;
 161         int stripe;
 162
 163         /* Since Lustre 2.4 only the parent FID is stored in filter_fid,
 164          * and the self fid is stored in the LMA and is printed below. */
 165         if (value_len < sizeof(ff->ff_parent)) {
 166                 fprintf(stderr, "%s: error: xattr '%s' too small (%zu bytes)\n",
 167                         debug_prog_name, name, value_len);
 168                 return -EINVAL;
 169         }
 170         fid_le_to_cpu(&ff->ff_parent, &ff->ff_parent);
 171         stripe = fid_ver(&ff->ff_parent); /* stripe index is stored in f_ver */
 172         ff->ff_parent.f_ver = 0;
 173
 174         fprintf(f, "fid: ");
 175         /* Old larger filter_fid should only ever be used with seq = 0.
 176          * FID-on-OST should use LMA for FID_SEQ_NORMAL OST objects. */
 177         if (value_len == sizeof(*ff))
 178                 fprintf(f, "objid=%llu seq=%llu ",
 179                         ext2fs_le64_to_cpu(ff->ff_objid),
 180                         ext2fs_le64_to_cpu(ff->ff_seq));
 181
 182         fprintf(f, "parent="DFID" stripe=%u", PFID(&ff->ff_parent), stripe);
 183         if (value_len >= sizeof(struct filter_fid_210)) {
 184                 struct filter_fid_210 *ff_new = value;
 185
 186                 fprintf(f, " stripe_size=%u stripe_count=%u",
 187                         ext2fs_le32_to_cpu(ff_new->ff_stripe_size),
 188                         ext2fs_le32_to_cpu(ff_new->ff_stripe_count));
 189                 if (ff_new->ff_pfl_id != 0)
 190                         fprintf(f, " component_id=%u component_start=%llu "
 191                                 "component_end=%llu",
 192                                 ext2fs_le32_to_cpu(ff_new->ff_pfl_id),
 193                                 ext2fs_le64_to_cpu(ff_new->ff_pfl_start),
 194                                 ext2fs_le64_to_cpu(ff_new->ff_pfl_end));
 195         }
 196
 197         if (value_len >= sizeof(struct filter_fid)) {
 198                 struct filter_fid *ff_new = value;
 199
 200                 fprintf(f, " layout_version=%u range=%u",
 201                         ext2fs_le32_to_cpu(ff_new->ff_layout_version),
 202                         ext2fs_le32_to_cpu(ff_new->ff_range));
 203         }
 204
 205         fprintf(f, "\n");
 206
 207         return 0;
 208 }
 209
 210 static int print_lmastr(FILE *f, void *name, void *value, size_t value_len)
 211 {
 212         struct lustre_mdt_attrs *lma = value;
 213         struct lustre_ost_attrs *loa = value;
 214
 215         if (value_len < offsetof(typeof(*lma), lma_self_fid) +
 216                         sizeof(lma->lma_self_fid)) {
 217                 fprintf(stderr, "%s: error: xattr '%s' too small (%zu bytes)\n",
 218                         debug_prog_name, name, value_len);
 219                 return -EINVAL;
 220         }
 221         fid_le_to_cpu(&lma->lma_self_fid, &lma->lma_self_fid);
 222         fprintf(f, "lma: fid="DFID" compat=%x incompat=%x\n",
 223                 PFID(&lma->lma_self_fid), ext2fs_le32_to_cpu(lma->lma_compat),
 224                 ext2fs_le32_to_cpu(lma->lma_incompat));
 225         if (value_len >= offsetof(typeof(*loa), loa_pfl_end) +
 226                   sizeof(loa->loa_pfl_end)) {
 227                 int idx;
 228                 int cnt;
 229
 230                 fid_le_to_cpu(&loa->loa_parent_fid, &loa->loa_parent_fid);
 231                 idx = loa->loa_parent_fid.f_ver & PFID_STRIPE_COUNT_MASK;
 232                 cnt = loa->loa_parent_fid.f_ver >> PFID_STRIPE_IDX_BITS;
 233                 loa->loa_parent_fid.f_ver = 0;
 234
 235                 fprintf(f, "  fid: parent="DFID" stripe=%u stripe_size=%u "
 236                         "stripe_count=%u", PFID(&loa->loa_parent_fid), idx,
 237                         ext2fs_le32_to_cpu(loa->loa_stripe_size), cnt);
 238                 if (loa->loa_pfl_id != 0)
 239                         fprintf(f, " component_id=%u component_start=%llu "
 240                                 "component_end=%llu",
 241                                 ext2fs_le32_to_cpu(loa->loa_pfl_id),
 242                                 ext2fs_le64_to_cpu(loa->loa_pfl_start),
 243                                 ext2fs_le64_to_cpu(loa->loa_pfl_end));
 244                 fprintf(f, "\n");
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int print_linkea(FILE *f, void *name, void *value, size_t value_len)
 251 {
 252         struct link_ea_header *leh = value;
 253         struct link_ea_entry *lee;
 254         int i;
 255
 256         if (value_len < sizeof(*leh) ||
 257             value_len < ext2fs_le64_to_cpu(leh->leh_len)) {
 258                 fprintf(stderr, "%s: error: xattr '%s' too small (%zu bytes)\n",
 259                         debug_prog_name, name, value_len);
 260                 return -EINVAL;
 261         }
 262
 263         if (ext2fs_le32_to_cpu(leh->leh_magic) != LINK_EA_MAGIC) {
 264                 fprintf(stderr, "%s: error: xattr '%s' bad magic '%#x'\n",
 265                         debug_prog_name, name,
 266                         ext2fs_le32_to_cpu(leh->leh_magic));
 267                 return -EINVAL;
 268         }
 269
 270         lee = leh->leh_entry;
 271         value_len -= sizeof(*leh);
 272
 273         for (i = 0; i < ext2fs_le32_to_cpu(leh->leh_reccount) &&
 274                     value_len > 2; i++) {
 275                 int reclen = lee->lee_reclen[0] << 8 | lee->lee_reclen[1];
 276                 struct lu_fid pfid;
 277
 278                 if (value_len < sizeof(*lee) || value_len < reclen) {
 279                         fprintf(stderr,
 280                                 "%s: error: xattr '%s' entry %d too small "
 281                                 "(%zu bytes)\n",
 282                                 debug_prog_name, name, i, value_len);
 283                         return -EINVAL;
 284                 }
 285
 286                 memcpy(&pfid, &lee->lee_parent_fid, sizeof(pfid));
 287                 fid_be_to_cpu(&pfid, &pfid);
 288                 fprintf(f, "%s idx=%u parent="DFID" name='%.*s'\n",
 289                         i == 0 ? "linkea:" : "         ", i, PFID(&pfid),
 290                         reclen - (int)sizeof(*lee), lee->lee_name);
 291
 292                 lee = (struct link_ea_entry *)((char *)lee + reclen);
 293                 value_len -= reclen;
 294         }
 295
 296         return 0;
 297 }
 298
 299 struct dump_attr_pretty {
 300         const char *dap_name;
 301         int (*dap_print)(FILE *f, void *name, void *value, size_t value_len);
 302 } dumpers[] = {
 303         {
 304                 .dap_name = "system.posix_acl_access",
 305                 .dap_print = print_acl,
 306         },
 307         {
 308                 .dap_name = "system.posix_acl_default",
 309                 .dap_print = print_acl,
 310         },
 311         {
 312                 .dap_name = "trusted.fid",
 313                 .dap_print = print_fidstr,
 314         },
 315         {
 316                 .dap_name = "trusted.lma",
 317                 .dap_print = print_lmastr,
 318         },
 319         {
 320                 .dap_name = "trusted.link",
 321                 .dap_print = print_linkea,
 322         },
 323         {
 324                 .dap_name = NULL,
 325         }
 326 };
 327
 328 static int dump_attr(char *name, char *value, size_t value_len,
 329                      ext2_ino_t inode_num, void *data)
 330 {
 331         struct dump_attr_pretty *dap;
 332         FILE *out = data;
 333         int rc = 0;
 334
 335         fprintf(out, "  ");
 336         if (EXT2_HAS_INCOMPAT_FEATURE(current_fs->super,
 337                                       EXT4_FEATURE_INCOMPAT_EA_INODE) &&
 338                                       inode_num != 0) {
 339                 fprintf(out, "inode <%u> ", inode_num);
 340         }
 341
 342         for (dap = dumpers; dap->dap_name != NULL; dap++) {
 343                 if (strcmp(name, dap->dap_name) == 0) {
 344                         rc = dap->dap_print(out, name, value, value_len);
 345                         break;
 346                 }
 347         }
 348         if (dap->dap_name == NULL || rc)
 349                 print_xattr(out, name, value, value_len, PRINT_XATTR_STATFMT);
 350
 351         return 0;
 352 }
 353
 354 void dump_inode_attributes(FILE *out, ext2_ino_t ino)
 355 {
 356         struct ext2_xattr_handle *h;
 357         size_t sz;
 358         errcode_t err;
 359
 360         err = ext2fs_xattrs_open(current_fs, ino, &h);
 361         if (err)
 362                 return;
 363
 364         err = ext2fs_xattrs_read(h);
 365         if (err)
 366                 goto out;
 367
 368         err = ext2fs_xattrs_count(h, &sz);
 369         if (err || sz == 0)
 370                 goto out;
 371
 372         fprintf(out, "Extended attributes:\n");
 373         err = ext2fs_xattrs_iterate(h, dump_attr, out);
 374         if (err)
 375                 goto out;
 376
 377 out:
 378         err = ext2fs_xattrs_close(&h);
 379 }
 380
 381 void do_list_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
 382                    void *infop EXT2FS_ATTR((unused)))
 383 {
 384         ext2_ino_t ino;
 385
 386         if (argc != 2) {
 387                 printf("%s: Usage: %s <file>\n", argv[0],
 388                        argv[0]);
 389                 return;
 390         }
 391
 392         if (check_fs_open(argv[0]))
 393                 return;
 394
 395         ino = string_to_inode(argv[1]);
 396         if (!ino)
 397                 return;
 398
 399         dump_inode_attributes(stdout, ino);
 400 }
 401
 402 void do_get_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
 403                   void *infop EXT2FS_ATTR((unused)))
 404 {
 405         ext2_ino_t ino;
 406         struct ext2_xattr_handle *h;
 407         FILE *fp = NULL;
 408         char *buf = NULL;
 409         size_t buflen;
 410         int i;
 411         int print_flags = 0;
 412         unsigned int handle_flags = 0;
 413         errcode_t err;
 414
 415         reset_getopt();
 416         while ((i = getopt(argc, argv, "Cf:rxV")) != -1) {
 417                 switch (i) {
 418                 case 'f':
 419                         if (fp)
 420                                 fclose(fp);
 421                         fp = fopen(optarg, "w");
 422                         if (fp == NULL) {
 423                                 perror(optarg);
 424                                 return;
 425                         }
 426                         break;
 427                 case 'r':
 428                         handle_flags |= XATTR_HANDLE_FLAG_RAW;
 429                         break;
 430                 case 'x':
 431                         print_flags |= PRINT_XATTR_HEX;
 432                         break;
 433                 case 'V':
 434                         print_flags |= PRINT_XATTR_RAW|
 435                                 PRINT_XATTR_NOQUOTES;
 436                         break;
 437                 case 'C':
 438                         print_flags |= PRINT_XATTR_C;
 439                         break;
 440                 default:
 441                         goto usage;
 442                 }
 443         }
 444
 445         if (optind != argc - 2) {
 446         usage:
 447                 printf("%s: Usage: %s [-f outfile]|[-xVC] [-r] <file> <attr>\n",
 448                                argv[0], argv[0]);
 449
 450                 goto out2;
 451         }
 452
 453         if (check_fs_open(argv[0]))
 454                 goto out2;
 455
 456         ino = string_to_inode(argv[optind]);
 457         if (!ino)
 458                 goto out2;
 459
 460         err = ext2fs_xattrs_open(current_fs, ino, &h);
 461         if (err)
 462                 goto out2;
 463
 464         err = ext2fs_xattrs_flags(h, &handle_flags, NULL);
 465         if (err)
 466                 goto out;
 467
 468         err = ext2fs_xattrs_read(h);
 469         if (err)
 470                 goto out;
 471
 472         err = ext2fs_xattr_get(h, argv[optind + 1], (void **)&buf, &buflen);
 473         if (err)
 474                 goto out;
 475
 476         if (fp) {
 477                 fwrite(buf, buflen, 1, fp);
 478         } else {
 479                 if (print_flags & PRINT_XATTR_RAW) {
 480                         if (print_flags & (PRINT_XATTR_HEX|PRINT_XATTR_C))
 481                                 print_flags &= ~PRINT_XATTR_RAW;
 482                         print_xattr_string(stdout, buf, buflen, print_flags);
 483                 } else {
 484                         print_xattr(stdout, argv[optind + 1],
 485                                     buf, buflen, print_flags);
 486                 }
 487                 printf("\n");
 488         }
 489
 490         ext2fs_free_mem(&buf);
 491 out:
 492         ext2fs_xattrs_close(&h);
 493         if (err)
 494                 com_err(argv[0], err, "while getting extended attribute");
 495 out2:
 496         if (fp)
 497                 fclose(fp);
 498 }
 499
 500 void do_set_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
 501                   void *infop EXT2FS_ATTR((unused)))
 502 {
 503         ext2_ino_t ino;
 504         struct ext2_xattr_handle *h;
 505         FILE *fp = NULL;
 506         char *buf = NULL;
 507         size_t buflen;
 508         unsigned int handle_flags = 0;
 509         int i;
 510         errcode_t err;
 511
 512         reset_getopt();
 513         while ((i = getopt(argc, argv, "f:r")) != -1) {
 514                 switch (i) {
 515                 case 'f':
 516                         if (fp)
 517                                 fclose(fp);
 518                         fp = fopen(optarg, "r");
 519                         if (fp == NULL) {
 520                                 perror(optarg);
 521                                 return;
 522                         }
 523                         break;
 524                 case 'r':
 525                         handle_flags |= XATTR_HANDLE_FLAG_RAW;
 526                         break;
 527                 default:
 528                         goto print_usage;
 529                 }
 530         }
 531
 532         if (!(fp && optind == argc - 2) && !(!fp && optind == argc - 3)) {
 533         print_usage:
 534                 printf("Usage:\t%s [-r] <file> <attr> <value>\n", argv[0]);
 535                 printf("\t%s -f <value_file> [-r] <file> <attr>\n", argv[0]);
 536                 goto out2;
 537         }
 538
 539         if (check_fs_open(argv[0]))
 540                 goto out2;
 541         if (check_fs_read_write(argv[0]))
 542                 goto out2;
 543         if (check_fs_bitmaps(argv[0]))
 544                 goto out2;
 545
 546         ino = string_to_inode(argv[optind]);
 547         if (!ino)
 548                 goto out2;
 549
 550         err = ext2fs_xattrs_open(current_fs, ino, &h);
 551         if (err)
 552                 goto out2;
 553
 554         err = ext2fs_xattrs_flags(h, &handle_flags, NULL);
 555         if (err)
 556                 goto out;
 557
 558         err = ext2fs_xattrs_read(h);
 559         if (err)
 560                 goto out;
 561
 562         if (fp) {
 563                 err = ext2fs_get_mem(current_fs->blocksize, &buf);
 564                 if (err)
 565                         goto out;
 566                 buflen = fread(buf, 1, current_fs->blocksize, fp);
 567         } else {
 568                 buf = argv[optind + 2];
 569                 buflen = parse_c_string(buf);
 570         }
 571
 572         err = ext2fs_xattr_set(h, argv[optind + 1], buf, buflen);
 573 out:
 574         ext2fs_xattrs_close(&h);
 575         if (err)
 576                 com_err(argv[0], err, "while setting extended attribute");
 577 out2:
 578         if (fp) {
 579                 fclose(fp);
 580                 ext2fs_free_mem(&buf);
 581         }
 582 }
 583
 584 void do_rm_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
 585                  void *infop EXT2FS_ATTR((unused)))
 586 {
 587         ext2_ino_t ino;
 588         struct ext2_xattr_handle *h;
 589         int i;
 590         errcode_t err;
 591
 592         if (argc < 3) {
 593                 printf("%s: Usage: %s <file> <attrs>...\n", argv[0], argv[0]);
 594                 return;
 595         }
 596
 597         if (check_fs_open(argv[0]))
 598                 return;
 599         if (check_fs_read_write(argv[0]))
 600                 return;
 601         if (check_fs_bitmaps(argv[0]))
 602                 return;
 603
 604         ino = string_to_inode(argv[1]);
 605         if (!ino)
 606                 return;
 607
 608         err = ext2fs_xattrs_open(current_fs, ino, &h);
 609         if (err)
 610                 return;
 611
 612         err = ext2fs_xattrs_read(h);
 613         if (err)
 614                 goto out;
 615
 616         for (i = 2; i < argc; i++) {
 617                 err = ext2fs_xattr_remove(h, argv[i]);
 618                 if (err)
 619                         goto out;
 620         }
 621 out:
 622         ext2fs_xattrs_close(&h);
 623         if (err)
 624                 com_err(argv[0], err, "while removing extended attribute");
 625 }
 626
 627 /*
 628  * Return non-zero if the string has a minimal number of non-printable
 629  * characters.
 630  */
 631 static int is_mostly_printable(const char *cp, int len)
 632 {
 633         int     np = 0;
 634
 635         if (len < 0)
 636                 len = strlen(cp);
 637
 638         while (len--) {
 639                 if (!isprint(*cp++)) {
 640                         np++;
 641                         if (np > 3)
 642                                 return 0;
 643                 }
 644         }
 645         return 1;
 646 }
 647
 648 static void safe_print(FILE *f, const char *cp, int len)
 649 {
 650         unsigned char   ch;
 651
 652         if (len < 0)
 653                 len = strlen(cp);
 654
 655         while (len--) {
 656                 ch = *cp++;
 657                 if (ch > 128) {
 658                         fputs("M-", f);
 659                         ch -= 128;
 660                 }
 661                 if ((ch < 32) || (ch == 0x7f)) {
 662                         fputc('^', f);
 663                         ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
 664                 }
 665                 fputc(ch, f);
 666         }
 667 }
 668
 669 static void dump_xattr_raw_entries(FILE *f, unsigned char *buf,
 670                                    unsigned int start, unsigned int len,
 671                                    unsigned value_start)
 672 {
 673         struct ext2_ext_attr_entry ent;
 674         unsigned int off = start;
 675         unsigned int vstart;
 676
 677         while (off < len) {
 678                 if ((*(__u16 *) (buf + off)) == 0) {
 679                         fprintf(f, "last entry found at offset %u (%04o)\n",
 680                                 off, off);
 681                         break;
 682                 }
 683                 if ((off + sizeof(struct ext2_ext_attr_entry)) >= len) {
 684                         fprintf(f, "xattr buffer overrun at %u (len = %u)\n",
 685                                 off, len);
 686                         break;
 687                 }
 688 #if WORDS_BIGENDIAN
 689                 ext2fs_swap_ext_attr_entry(&ent,
 690                         (struct ext2_ext_attr_entry *) (buf + off));
 691 #else
 692                 ent = *((struct ext2_ext_attr_entry *) (buf + off));
 693 #endif
 694                 fprintf(f, "offset = %d (%04o), name_len = %u, "
 695                         "name_index = %u\n",
 696                         off, off, ent.e_name_len, ent.e_name_index);
 697                 vstart = value_start + ent.e_value_offs;
 698                 fprintf(f, "value_offset = %d (%04o), value_inum = %u, "
 699                         "value_size = %u\n", ent.e_value_offs,
 700                         vstart, ent.e_value_inum, ent.e_value_size);
 701                 off += sizeof(struct ext2_ext_attr_entry);
 702                 fprintf(f, "name = ");
 703                 if ((off + ent.e_name_len) >= len)
 704                         fprintf(f, "<runs off end>");
 705                 else
 706                         safe_print(f, (char *)(buf + off), ent.e_name_len);
 707                 fputc('\n', f);
 708                 if (ent.e_value_size == 0)
 709                         goto skip_value;
 710                 fprintf(f, "value = ");
 711                 if (ent.e_value_inum)
 712                         fprintf(f, "<ino %u>", ent.e_value_inum);
 713                 else if (ent.e_value_offs >= len ||
 714                          (vstart + ent.e_value_size) > len)
 715                         fprintf(f, "<runs off end>");
 716                 else if (is_mostly_printable((char *)(buf + vstart),
 717                                         ent.e_value_size))
 718                         safe_print(f, (char *)(buf + vstart),
 719                                    ent.e_value_size);
 720                 else {
 721                         fprintf(f, "<hexdump>\n");
 722                         do_byte_hexdump(f, (unsigned char *)(buf + vstart),
 723                                         ent.e_value_size);
 724                 }
 725                 fputc('\n', f);
 726         skip_value:
 727                 fputc('\n', f);
 728                 off += (ent.e_name_len + 3) & ~3;
 729         }
 730 }
 731
 732 void raw_inode_xattr_dump(FILE *f, unsigned char *buf, unsigned int len)
 733 {
 734         __u32 magic = ext2fs_le32_to_cpu(*((__le32 *) buf));
 735
 736         fprintf(f, "magic = %08x, length = %u, value_start =4 \n\n",
 737                 magic, len);
 738         if (magic == EXT2_EXT_ATTR_MAGIC)
 739                 dump_xattr_raw_entries(f, buf, 4, len, 4);
 740 }
 741
 742 void block_xattr_dump(FILE *f, unsigned char *buf, unsigned int len)
 743 {
 744         struct ext2_ext_attr_header header;
 745
 746 #ifdef WORDS_BIGENDIAN
 747         ext2fs_swap_ext_attr_header(&header,
 748                                     (struct ext2_ext_attr_header *) buf);
 749 #else
 750         header = *((struct ext2_ext_attr_header *) buf);
 751 #endif
 752         fprintf(f, "magic = %08x, length = %u\n", header.h_magic, len);
 753         if (header.h_magic != EXT2_EXT_ATTR_MAGIC)
 754                 return;
 755         fprintf(f, "refcount = %u, blocks = %u\n", header.h_refcount,
 756                 header.h_blocks);
 757         fprintf(f, "hash = %08x, checksum = %08x\n", header.h_hash,
 758                 header.h_checksum);
 759         fprintf(f, "reserved: %08x %08x %08x\n\n", header.h_reserved[0],
 760                 header.h_reserved[1], header.h_reserved[2]);
 761
 762         dump_xattr_raw_entries(f, buf,
 763                                sizeof(struct ext2_ext_attr_header), len, 0);
 764 }